18 inches
According to federal law the shortest barrel length allowed for both rifle or shotgun is 16 inches.
Unable to answer as asked. Is it already a shotgun or will it be built from a virgin receiver?
Eighteen inches for the barrel alone. This does not count any add-ons such as a choke.
Laws restricting sawed-offs are federal, though there's nothing illegal about shortening the barrel of a shotgun as long as the final product is at least 18 inches.
Depends on what you want to do with it and if you want to go to the trouble of getting the appropriate federal approval.
Without requiring NFA permits, 16 inches, and that's federal law.
A shotgun barrel with a cylinder bore choke.
18 inches and a total overall length of at least 26 inches, just like in the rest of the US.
yes a rifled shotgun barrel or smooth shotgun barrel
Close the shotgun action and insert a rod down the barrel to the standing breech (to the rear edge of the chamber or where the back of the shotgun shell would be). Mark the end of the rod protruding from the barrel. Remove the rod and measure its length. Per federal law (GCA 1934), this must be a minimum of 18"
Buy Shotgun. Buy Shotgun.
Federal law requires that a shotgun have a minimum barrel length of 18" and a minimum overall length of 28". Colorado law is not more restrictive.